《PHP 5权威编程》第三章读后感

复制PHP内容到剪贴板

PHP代码:

/**
 * php5版 db.php
 */
class db 
{
 public $conn_id;
 public $sql_num_queries=0;
 
 private $user;
 private $host;
 private $dbname;
 private $persistency;
 private $query_result;
 private $sql;
 
 
 public function __construct($server, $sqluser, $sqlpassword, $database, $port = false, $persistency = false, $new_link = false)
 {
  $this->user = $sqluser;
  $this->host = $sqluser;
  $this->dbname = $database;
  $this->persistency = $persistency;
  
  $this->conn_id = ($this->persistency) ? (mysql_pconnect($this->host, $this->user, $sqlpassword, $new_link)) : (mysql_connect($this->host, $this->user, $sqlpassword, $new_link));
  
  if($this->conn_id && $this->dbname!='')
  {
   @mysql_query("SET NAMES 'utf8'",$this->conn_id);
   @mysql_select_db($this->dbname);
  }
 }
 
 public function __destruct()
 {
  if(is_resource($this->query_result))
  {
   @mysql_free_result($this->query_result);
  }
 }
}

复制PHP内容到剪贴板

PHP代码:

/**
 *  PHP4 db.php
 */
class db
{
 var $user;
 var $host;
 var $dbname;
 var $persistency;
 var $conn_id;
 var $sql_num_queries = 0;
 var $query_result;
 var $sql;
 
 function db_connect($server,$sqluser,$sqlpassword,$database,$port = false,$persistency = false,$new_link = false)
 {
  $this->user = $sqluser;
  $this->host = $server;
  $this->dbname = $database;
  $this->persistency = $persistency;
  
  $this->conn_id = ($this->persistency)?@mysql_pconnect($this->host,$this->user,$sqlpassword,$new_link):@mysql_connect($this->host,$this->user,$sqlpassword,$new_link);
  if($this->conn_id && $this->dbname!='')
  {
   @mysql_query("SET NAMES 'utf8'",$this->conn_id);
   @mysql_select_db($this->dbname);
  }
 }

复制PHP内容到剪贴板

PHP代码:

[font=NewCenturySchlbk-Roman][size=10pt]class A 
{

private $a;
function __construct()
{
  $this->a = 1;
}
}[/size][/font]
[font=NewCenturySchlbk-Roman][size=10pt]class B extends A 
{
function __construct()
{
  echo $this->a;
}

}[/size][/font]
[font=NewCenturySchlbk-Roman][size=10pt]$b = new B();[/size][/font]